feat(lib): switch __init__ to ONNX-backed generate/generate_scroll

tests/unit/test_scroll.py

@@ -35,3 +35,19 @@ def test_scroll_invalid_path() -> None:
     from ai_mouse.scroll import ScrollModel
     with pytest.raises(ModelLoadError):
         ScrollModel(model_path="/no/such/path")
+
+
+def test_scroll_model_timestamps_monotonic() -> None:
+    from ai_mouse.scroll import ScrollModel
+    m = ScrollModel()
+    events = m.generate(0, 2000, mode="target")
+    times = [e["t"] for e in events]
+    for i in range(1, len(times)):
+        assert times[i] >= times[i - 1]
+
+
+def test_scroll_model_deltaY_are_integers() -> None:
+    from ai_mouse.scroll import ScrollModel
+    m = ScrollModel()
+    events = m.generate(0, 2000, mode="target")
+    assert all(isinstance(e["deltaY"], int) for e in events)